http://www.firmfeel.com/default.htm

I don't think you can do better than this if you need a unit.

2014 Durango R/T
2004 Dodge Ram 3500 SRW SLT short quad Cummins 6 speed
1998 Dodge Durango SLT 5.2
1971 Plymouth Duster-
<<<<<MOPAR SPOKEN HERE>>>>>